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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
-9/z = 5 // - 5
-9/z-5 = 0
-9*z^-1 = 5 // : -9
z^-1 = -5/9
-1 < 0
1/(z^1) = -5/9 // * z^1
1 = -5/9*z^1 // : -5/9
-9/5 = z^1
z = -9/5
z = -9/5
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